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LoveGrowingIt
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Mg, from Epsom Salt, is the central atom in the chlorophyll molecule. It isn't the only element required to make chlorophyll molecules, however. Mg is just the most likely missing element. If another essential element is missing, it can falsely look like Mg deficiency. Zinc (Zn) is one that resembles Mg deficiency. I'm not saying there's a Zn deficiency, I'm mostly just saying symptoms can be misleading.
Epsom Salt has been used by gardeners for a long time. My experience is it's difficult to inhibit Ca uptake due to an imbalance with Mg. Ca deficiency or inhibition is easy to spot and is easily remedied. I use gypsum for it. Also, excess Mg is indicated by very dark green leaves. If the leaves aren't unusually green, then add some Ca.
Epsom Salt has been used by gardeners for a long time. My experience is it's difficult to inhibit Ca uptake due to an imbalance with Mg. Ca deficiency or inhibition is easy to spot and is easily remedied. I use gypsum for it. Also, excess Mg is indicated by very dark green leaves. If the leaves aren't unusually green, then add some Ca.
I first wondered if the problem is P deficiency. It could be. I believe I have seen this before, though. It happened when nutrients were added or changed (usually during early vegetation stage). I'm thinking there may have been an early Mg deficiency. After the plants were transplanted, the roots could access more nutrients, most likely from the Gaia Green 4-4-4 that is in it. Improvement in color then starts in the center of the leaves, resulting in that P-deficiency-like pattern.I just transplanted them to bigger pots 3 days ago.